Thermo-mechanical activities at Valencia V. Castillo, C. Lacasta, A. Oyanguren, P. Ruiz 8 th International Workshop on DEPFET Detectors and applications (IFIC - Valencia) 21/9/2011

Arantza Oyanguren2 Outline 8 th International Workshop on DEPFET Detectors and Applications  Mock-up status at VLC  Studies of air flow cooling: - Effect of CO2 cooling + air flow at several temperatures on the ladders  Conclusions  Plans at VLC

Arantza Oyanguren3 Mock-up CO 2 open system Nitrogen liquid Dewar (cooled air) Thermally isolated box with dry atmosphere chiller IR camera Mock-up 8 th International Workshop on DEPFET Detectors and Applications

Arantza Oyanguren4 Mock-up Mock-up status: - Mechanical dummy temporarily fixed in the CrCo sample: (plastic nut + screw ended with a wire embedded in the hole) - Thermal grease for the thermal contact - One resistor sample in the outer layer - Set voltages: Sensor: 12 V  P ~ 1W Switchers: 3V  P ~ 0.25 W DCDs/DHPs: 20V  P ~2.5 W It works! (appart from the left switchers) 8 th International Workshop on DEPFET Detectors and Applications

Mock-up Calibration tool for the IR camera: (  depends on the material) Kapton Cu Al sensor DCD/ DHP DCD/ DHP switcher (broken) mechanical dummy Tipp -ex grease Tape 2 Tape 1 Marker Al box filled with coolant: cooled down with chiller, heated with heaters. Study material  Arantza Oyanguren5  ~ 0.65  ~ 0.35  ~ 0.18 T= 90ºC T= -10ºC 8 th International Workshop on DEPFET Detectors and Applications

Arantza Oyanguren6 Air flow studies - Effect of blowing air at room temperature: -The air flow (at room T) decreases and homogenizes the temperature along the detector.  Decreases T ~ 15  C  Max  T along the ladder 18  C  8  C Camera position DCD/ DHP DCD/ DHP (corrected emmisivity) DCD/ DHP DCD/ DHP 8 th International Workshop on DEPFET Detectors and Applications (v air (inlet) ~ 2m/s)

Arantza Oyanguren7 Air flow studies - Cooling down the end flanges with CO2 - Blowing air/N 2 at different temperatures (cooled down with N2 liquid atmosphere) Camera position T (ºC) (corrected emmisivity) 25 ºC - Bumps ?? (crab legs) - With CO 2 + air flow  T along the ladder ~ 20ºC (!?) - Detector on: T ~ 45ºC - Effect of CO 2 + air flow : T ~ 20ºC (or below) Looking at the central region of the sensor: Looking at the edges: 8 th International Workshop on DEPFET Detectors and Applications (v air (inlet) ~ 2m/s)

Arantza Oyanguren8 Air flow studies - Problems of IR transparence due to the thickness of the detector: left switchers off (corrected emmisivity) sensor switchers - sensor - switchers - Tipp-ex marks behind in the Cu inner ladder Present setup Previous setup Tipp-ex marks behind End flanges Camera position T(ºC) Detector on, CO2 in the end flanges, no air flow End flanges Sensor and switchers: expected about same  and behaviour 8 th International Workshop on DEPFET Detectors and Applications

Arantza Oyanguren9 Air flow studies - sensor - switchers (corrected emmisivity) - Detector on, CO 2 in the endflanges, cooled air flow  Effect of a polycarbonate sheet (IR opaque) behind the mechanical dummy (i.e. between the inner and outer ladders: A few degrees (~3  ) difference, not observed for the switchers region, due to the reflexion in the inner ladder, seen by the IR camera through the thick sensor. Effect of IR transparence due to the thickness of the sensor (?)  T~10ºC 8 th International Workshop on DEPFET Detectors and Applications Camera position T(ºC)

Arantza Oyanguren10 8 th International Workshop on DEPFET Detectors and Applications - More realistic conditions for the detector, set voltages so: Sensor:  P ~ 0.5W Switchers:  P ~ 0.5W DCDs/DHPs:  P ~ 8W - Inner cupper ladder covered with a polycarbonate dummy, opaque to IR Camera position T (ºC) (corrected emmisivity) Sensor Detector on Background (room T) End flanges cooled with CO 2 Air flow at room T Air/N 2 flow cooled [-8,-15]  C C. Mariñas simulation Air flow studies

Arantza Oyanguren11 - Sensor region (P~0.5W): 8 th International Workshop on DEPFET Detectors and Applications - Temperature for the sensor when switching on the detector: ~ 60  C - Cooling the endflanges (CO 2 ): T sensor< 25  C (~ room T  to check colder environment) - Blowing air at room T  T sensor < 20  C and homogenus - Blowing cooled air (-8,-15)  C  T sensor < 15  C and homogeneus -  T max along the sensor ~ 10  C (contact + remaining transparence) - For a proper  T estimation from the enflanges one should have all detectors on (but should be ok following the Karlsruhe test (see next page)) Camera position T (ºC) Sensor Detector on Background (room T) End flanges cooled with CO 2 Air flow at room T Air/N 2 flow cooled [-8,-15]  C Air flow studies

Arantza Oyanguren12 From Karlsruhe ( S. Heindl, Feb 2011) : Silicon pieces with resistors (20W each) 120W + CO 2 Cooling:  Endflange at < -10  C (most probes) PT1000s 8 th International Workshop on DEPFET Detectors and Applications Air flow studies

Arantza Oyanguren13 - Switchers region (P~0.5W): 8 th International Workshop on DEPFET Detectors and Applications - Only right switcher was operating - Temperature for the switchers when the detector is switched on ~ 40  C - Cooling the endflanges (CO 2 ): T sensor ~  C (room T  to check colder environm.) - Blowing air at room T  T sensor < 25  C and homogenus - Blowing cooled air (-8,-15)  C  T sensor < 25  C and homogeneus - Small  T max along the detector < 10  C Camera position T (ºC) Detector on Background (room T) End flanges cooled with CO 2 Air flow at room T Air/N 2 flow cooled [-8,-15]  C Switchers ( corrected emmisivity) Air flow studies

Arantza Oyanguren14 Conclusions - Valencia mockup set up and understood. - At present, all tests show:  Cooled air flow decreases the ladder temperature below ~20  C   T max along the ladder less or around 10  C - Valencia activity on thermo-mechanical issues will smoothly decrease in the next year, but at present this setup may be used for any envisaged thermal test In particular: 8 th International Workshop on DEPFET Detectors and Applications

1.5m pipe coil at the CO 2 return to cool down the air: Air flow temperature in the outlet ~  C Arantza Oyanguren15 Mock-up Until now, air or N 2 gaseous cooled by the atmosphere inside the liquid N 2 Dewar (-80  C) New CO 2 exchanged system to cool down the air flow: 8 th International Workshop on DEPFET Detectors and Applications - Test air flow cooling with the CO 2 return

Arantza Oyanguren16 Plans Al samples Carbon fibers 8 th International Workshop on DEPFET Detectors and Applications - Test air flow effect in the inner ladders (mainly for the switchers) through carbon fibers - Set up the new endflanges of aluminium and/or stainless steel (ladders better screwed, better fixed and better thermal contact)

Arantza Oyanguren 8 th International Workshop on DEPFET Detectors and Applications Capacitive Non-Contact Displacement detectors: ATLAS setup - Test possible vibrations in the detectors due to the air flow Plans

Arantza Oyanguren18  Dummy ladders: Heaters Polycarbonate Al Cu Backup Resistor samples

Arantza Oyanguren19 Backup  Effect of air velocity - It is enough to have a very low speed flow air to achieve a proper heat dissipation in the ladder (1W  T~ 6-7ºC), (Expected behaviour from Carlos simulations)

Arantza Oyanguren20  Inner ladder: Backup heaters (3W) CO2, No air flow Air flow T~0C* * entering in the box; T in the CB? Air flow T~-20C * Camera position T (  C)